sudo raspi-config
Advanced Options
SSH
Serial

sudo nano /etc/network/interfaces

#################################

auto lo
iface lo inet loopback
iface eth0 inet static
address 192.168.137.10
netmask 255.255.255.0
network 192.168.137.0
gateway 192.168.137.1
allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp

#################################


sudo nano /etc/dhcpcd.conf

##############################

# A sample configuration for dhcpcd.
# See dhcpcd.conf(5) for details.

# Allow users of this group to interact with dhcpcd via the control socket.
#controlgroup wheel

# Inform the DHCP server of our hostname for DDNS.
hostname

# Use the hardware address of the interface for the Client ID.
clientid
# or
# Use the same DUID + IAID as set in DHCPv6 for DHCPv4 ClientID as per RFC4361.
#duid

# Persist interface configuration when dhcpcd exits.
persistent

# Rapid commit support.
# Safe to enable by default because it requires the equivalent option set
# on the server to actually work.
option rapid_commit

# A list of options to request from the DHCP server.
option domain_name_servers, domain_name, domain_search, host_name
option classless_static_routes
# Most distributions have NTP support.
option ntp_servers
# Respect the network MTU.
# Some interface drivers reset when changing the MTU so disabled by default.
#option interface_mtu

# A ServerID is required by RFC2131.
require dhcp_server_identifier

# Generate Stable Private IPv6 Addresses instead of hardware based ones
slaac private
# A hook script is provided to lookup the hostname if not set by the DHCP
# server, but it should not be run by default.
nohook lookup-hostname
interface eth0

static ip_address=192.168.137.10/24
static routers=192.168.137.1
static domain_name_servers=192.168.137.1

###############################

 

if you are under a proxy network you need to configure proxy settings so that your pi can communicate with Internet
for that you need to configure this file.
 

sudo nano /etc/apt/apt.conf

Acquire::http::proxy "http://username:password@proxyip:proxyport/";
Acquire::https::proxy "http://username:password@proxyip:proxyport/";
Acquire::ftp::proxy "http://username:password@proxyip:proxyport/";


sudo rm /var/lib/dhcp/*
sudo reboot